Argos offers screenshot diffs and visual testing for teams checking whether a PR changes existing pages.
It checks screenshot differences for pull requests.
When checking whether a PR changes existing pages, fix viewport sizes before reviewing layout changes.
Applitools offers visual testing and interface comparison for teams comparing interface differences across browsers.
BrowserStack offers a real device and browser testing platform for teams reproducing a web issue on a specific phone.
Chromatic offers component review and visual testing for teams reviewing component states after changes.